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Open AccessArticle

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System

1
School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
2
Section of Thermal Energy, Department of Mechanical Engineering, Technical University of Denmark, Building 403, Nils Koppels Allé, 2800 Kgs. Lyngby, Denmark
*
Authors to whom correspondence should be addressed.
Entropy 2019, 21(4), 428; https://doi.org/10.3390/e21040428
Received: 11 February 2019 / Revised: 11 April 2019 / Accepted: 18 April 2019 / Published: 22 April 2019
(This article belongs to the Section Thermodynamics)
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PDF [4678 KB, uploaded 26 April 2019]
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Abstract

An integrated solar combined cycle (ISCC) with a low temperature waste heat recovery system is proposed in this paper. The combined system consists of a conventional natural gas combined cycle, organic Rankine cycle and solar fields. The performance of an organic Rankine cycle subsystem as well as the overall proposed ISCC system are analyzed using organic working fluids. Besides, parameters including the pump discharge pressure, exhaust gas temperature, thermal and exergy efficiencies, unit cost of exergy for product and annual CO2-savings were considered. Results indicate that Rc318 contributes the highest exhaust gas temperature of 71.2℃, while R113 showed the lowest exhaust gas temperature of 65.89 at 800 W/m2, in the proposed ISCC system. The overall plant thermal efficiency increases rapidly with solar radiation, while the exergy efficiency appears to have a downward trend. R227ea had both the largest thermal efficiency of 58.33% and exergy efficiency of 48.09% at 800W/m2. In addition, for the organic Rankine cycle, the exergy destructions of the evaporator, turbine and condenser decreased with increasing solar radiation. The evaporator contributed the largest exergy destruction followed by the turbine, condenser and pump. Besides, according to the economic analysis, R227ea had the lowest production cost of 19.3 $/GJ. View Full-Text
Keywords: ISCC; CCPP; ORC; thermodynamic analysis; solar energy; waste heat recovery ISCC; CCPP; ORC; thermodynamic analysis; solar energy; waste heat recovery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, S.; Fu, Z. Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System. Entropy 2019, 21, 428.

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